. Elementary and dental radiography / by Howard Riley Raper . the temporary molarsare already considerably absorbed, still enough may be left to serve todeflect the oncoming bicuspids in the direction desired. This slide (Fig. 146), from the collection of Dr. Matthew Oyer(radiograph by Pancoast, of Philadelphia), shows nicely the usual rela-tion of the erupting bicuspids to their predecessors, the temporary will be noted that the apices of the bicuspids are still unformed, and itis clear that if these teeth can be led into proper positions during eruption,the formation of the apices
. Elementary and dental radiography / by Howard Riley Raper . the temporary molarsare already considerably absorbed, still enough may be left to serve todeflect the oncoming bicuspids in the direction desired. This slide (Fig. 146), from the collection of Dr. Matthew Oyer(radiograph by Pancoast, of Philadelphia), shows nicely the usual rela-tion of the erupting bicuspids to their predecessors, the temporary will be noted that the apices of the bicuspids are still unformed, and itis clear that if these teeth can be led into proper positions during eruption,the formation of the apices afterward affords the most permanent reten-tion. A casual glance at the upper temporary molars might create adoubt as to the probability of moving the unerupted bicuspids, but thereis an easily overlooked factor, viz., the palatal roots of these molars do 164 DENTAL RADIOGRAPHY not show in radiographs of this region at this period, because they lie be-hind the crowns of the bicuspids; that is to say behind, in relation tothe source of light, the X-ray Fig. 146. Radiograph made to show relation of temporary molar roots to advancing bicuspids.(Collection of Dr. Cryer. Radiograph by Pancoast, of Philadelphia.) 7. Co Observe moping Ceetb. Fig. 147 demonstrates the congenital absence of Tig*. 147, 14$ and 149. the upper lateral incisors. The orthodontic appliance, seen in the radiograph, is being used to draw the centrals together. It was highly important in this case that the teeth be THE USES OF THE RADIOGRAPH IN DENTISTRY 165 moved through the alveolar process en masse, and not tipped. Themovement desired was one which would make the roots parallel whenthe crowns of the teeth came together, so that posts could be set in thecanals of the central incisors, and a bridge made to restore the lost lat-erals. Fig. 148 was taken about a month after Fig. 147. It shows thatthe teeth have been moved together, but there is too much tipping of the
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